KR101809862B1 - Hermetic compressor - Google Patents

Abstract

The compressor 1 has a suction hole 23 provided in the cylinder 21. The suction hole 23 has a plurality of portions having different diameters from the outer peripheral side to the inner peripheral side of the cylinder 21, The center axis C1 of the outer suction hole 23a among the plurality of portions is located at the center axis C3 of the cylinder 21, And the center axis C2 of the inner peripheral side suction hole 23b among the plurality of portions is parallel to the center axis C1 of the outermost peripheral portion and also the spring hole 26 And eccentric in the opposite direction.

Description

{HERMETIC COMPRESSOR}

The present invention relates to a hermetic compressor used in a refrigeration cycle such as an air conditioner, a refrigerator or a refrigerator.

One of the methods for improving the compressor efficiency is to reduce the suction pressure loss by enlarging the diameter of the suction hole. However, since the suction hole is provided close to the vane groove and the spring hole provided in the cylinder for expanding the displacement volume of the compressor, the diameter of the suction hole is limited.

Patent Document 1 discloses a configuration in which the diameter of the suction hole on the inner circumferential side of the cylinder is made larger than the diameter of the suction hole on the outer circumferential side of the cylinder in order to reduce the suction resistance.

Patent Document 2 discloses a configuration in which a suction hole is provided so that the central axis of the suction hole is inclined in a direction approaching the tangent to the inner circumferential surface of the cylinder chamber in order to reduce the flow resistance of the suction gas. In this document, the suction hole is bent so that the central axis of the suction hole on the suction pipe connecting side faces the center of the cylinder and the central axis of the suction hole on the cylinder chamber side is inclined in the direction close to the tangent to the inner surface of the cylinder chamber Configuration is described.

Japanese Patent Application Laid-Open No. 2001-280277 (Fig. 6) Japanese Patent Application Laid-Open No. 7-27074 (Figs. 1 and 3)

In the structure described in Patent Document 1, since the diameter of the suction hole is enlarged to the inner peripheral side of the cylinder, there is a problem that the suction hole can not be formed only by drilling from the outer peripheral side of the cylinder, and productivity is lowered.

Further, in the structure described in Patent Document 2, since the central axis of the suction hole is not orthogonal to the outer circumferential surface of the cylinder, it is difficult to perform drilling and a special joint is required for the welded portion with the closed container, . Further, in the configuration in which the suction holes described in this document are bent, there is a problem that the productivity is deteriorated because the suction hole can not be formed by the ordinary drilling.

An object of the present invention is to provide a hermetic compressor capable of improving the efficiency of a compressor while preventing a decrease in productivity.

A closed compressor according to the present invention comprises a cylinder housed in a hermetically sealed container, a rolling piston eccentrically rotating along the inner circumferential surface of the cylinder, a vane for partitioning the inside of the cylinder into a suction chamber and a compression chamber, A spring hole provided in the cylinder for receiving the vane spring and a suction hole provided in the cylinder for sucking a fluid from the outside into the suction chamber, Wherein the cylinder has a plurality of portions having different diameters from the outer circumferential side to the inner circumferential side of the cylinder and the plurality of portions are formed to have a smaller diameter toward the inner circumferential side of the cylinder, Wherein the central axis of the portion intersects the central axis of the cylinder, and the central axis of the other portion of the plurality of portions intersects the central axis of the cylinder, And is eccentric in a direction opposite to a direction in which the spring hole is formed with respect to the central axis.

According to the present invention, since the central axis of the outermost periphery portion of the suction hole can be perpendicular to the outer peripheral surface of the cylinder, the perforation of the suction hole can be easily performed, and the productivity of the compressor can be prevented from lowering. Further, by eccentricity of the central axis of the other portion of the suction hole in the direction opposite to the spring hole, the suction pressure loss can be reduced while maintaining the cylinder height of the compressor, so that the compressor efficiency of the compressor can be improved.

1 is a longitudinal sectional view showing a configuration of a compressor 1 according to a first embodiment of the present invention.
Fig. 2 is a top view showing the configuration of a cylinder 21 capable of expanding the displacement volume while maintaining the cylinder height, which is a premise of Embodiment 1 of the present invention. Fig.
3 is a top view showing the configuration of the cylinder 21 of the compressor 1 according to the first embodiment of the present invention.
4 is a top view showing the structure of the suction hole 23 formed in the cylinder 21 of the compressor 1 according to the first embodiment of the present invention.

Embodiment Mode 1.

(Hereinafter simply referred to as " compressor ") according to Embodiment 1 of the present invention will be described. 1 is a longitudinal sectional view showing a structure of a compressor 1 (rolling piston type compressor) according to the present embodiment. The compressor 1 is one of the components of a refrigeration cycle used in, for example, an air conditioner, a refrigerator, a refrigerator, a vending machine, a hot water heater, and the like. Further, in the following drawings including Fig. 1, there is a case where the dimensions, the shape and the like of the respective constituent members are different from the actual ones.

The compressor 1 shown in Fig. 1 sucks a fluid (for example, a refrigerant circulating in a refrigeration cycle), compresses the fluid, and discharges it in a state of high temperature and high pressure. The compressor (1) has a compression mechanism (10) and a motor base (50) for driving the compression mechanism (10). The compression mechanism section 10 and the electric motor section 50 are housed in a hermetically sealed container 60. At the bottom of the hermetically sealed container 60, refrigerating machine oil at the time of storage is stored.

The electric motor base 50 includes a stator 51 and a rotor 52. [ The outer circumferential portion of the stator 51 is fixed to the inner circumferential surface of the hermetically sealed container 60. The crankshaft 53 is inserted into the rotor 52. The crankshaft 53 is provided with two upper and lower eccentric portions 54a, 54b which are eccentric in opposite directions (directions shifted by 180 degrees in phase).

The compression mechanism 10 includes two cylinders 21 and 31 and a partition plate 40 for partitioning the cylinder 21 and the cylinder 31 and a cylinder 21, A main shaft receiving portion 11 and a main shaft receiving portion 12 which are disposed on both upper and lower ends of the stacked body on which the cylinders 31 and 40 and the cylinders 31 are accumulated and which also serve as end plates of the stacked bodies, A rolling piston 22 in which an eccentric portion 54a is inserted and a rolling piston 32 accommodated in the cylinder 31 and in which an eccentric portion 54b is inserted. Although not shown in Fig. 1, a vane for dividing the inner circumferential side space of the cylinders 21 and 31 into the suction chamber and the compression chamber (high pressure chamber) is inserted into each of the vane grooves of the cylinders 21 and 31 .

The compressor 1 is provided adjacent to the outside of the hermetically sealed container 60 and includes an accumulator 61 for storing the low-pressure refrigerant introduced from the outside (for example, the evaporator side of the refrigeration cycle) A suction pipe 62 for suctioning the refrigerant gas in the accumulator 61 into the hermetically sealed container 60 and a suction hole 62 for guiding the refrigerant gas sucked through the suction pipe 62 to the suction chamber in the cylinder 21 A suction hole 33 for guiding the refrigerant gas sucked through the suction pipe 63 to the suction chamber in the cylinder 31 and a high pressure refrigerant gas compressed in each compression chamber in the space in the hermetically sealed container 60 (Not shown in Fig. 1) for discharging the refrigerant gas and a discharge tube 64 for discharging the high-pressure refrigerant gas discharged into the space in the sealed container 60 to the outside (for example, the condenser side of the refrigeration cycle) have.

In the compressor 1 constructed as described above, the crankshaft 53 inserted into the rotor 52 is rotated by the rotation of the rotor 52, and the eccentric portions 54a and 54b ). As the eccentric portion 54a rotates, the rolling piston 22 rotates and slides inside the cylinder 21. Further, as the eccentric portion 54b rotates, the rolling piston 32 rotates and slides inside the cylinder 31. That is, the rolling pistons 22 and 32 are eccentrically rotated along the inner circumferential surfaces of the cylinders 21 and 31, respectively.

As a result, refrigerant gas is sucked from the suction pipes 62 and 63 into the suction chambers in the cylinders 21 and 31, and the refrigerant gas is compressed in the compression chambers in the cylinders 21 and 31. The high-pressure refrigerant gas compressed in the compression chamber is discharged into the closed vessel 60 and discharged from the discharge vessel 64 to the outside of the closed vessel 60.

Fig. 2 is a top view showing a configuration of a cylinder 21 that can expand the displacement volume while maintaining the cylinder height, which is the premise of the present embodiment. Since the cylinder 31 has the same configuration as that of the cylinder 21, the illustration and description thereof are omitted. 2, the cylinder 21 includes a vane groove 24 formed in a radially outward direction from the inner circumferential surface thereof, a spring formed in parallel with the vane groove 24 from the outer circumferential surface toward the radially inner side (center side) And has a hole 26. In the vane groove 24, a vane 25 is slidably inserted. A vane spring (30) for urging the vane (25) toward the rolling piston (22) is accommodated in the spring hole (26). The tip end of the vane 25 makes contact with the outer peripheral surface of the rolling piston 22 due to the biasing force of the vane spring 30. [

The cylinder 21 has a suction hole 23 and a discharge hole 27 disposed on both sides thereof with the vane groove 24 and the spring hole 26 sandwiched in the circumferential direction. The suction hole 23 penetrates between the inner peripheral surface and the outer peripheral surface of the cylinder 21 in the radial direction. The discharge hole 27 is formed radially outward from the inner circumferential surface of the cylinder 21 and communicates with the space in the closed container 60 through the discharge hole provided in the main shaft receiving portion 11 (single plate) and the discharge muffler have. The space in the cylinder 21 is partitioned by a vane 25 into a suction chamber 28 communicating with the suction hole 23 and a compression chamber 29 communicating with the discharge hole 27.

The suction hole 23 has an outer peripheral suction hole 23a formed on the outer peripheral surface side of the cylinder 21 and an inner peripheral suction hole 23b formed on the inner peripheral surface side of the cylinder 21. The cross-sectional shapes of the outer suction hole 23a and the inner suction hole 23b are all circular. The diameter of the outer peripheral suction hole 23a is? D, and the diameter of the inner peripheral suction hole 23b is? D (? D <? D) smaller than? D. That is, the suction hole 23 has a plurality of portions having different diameters from the outer peripheral side to the inner peripheral side of the cylinder 21 (in the direction of the central axis of the suction hole 23). The plurality of portions of the suction hole 23 are formed to have a smaller diameter on the inner circumferential side of the cylinder 21. 2, the central axis of the outer peripheral suction hole 23a and the central axis of the inner peripheral suction hole 23b are coaxial, and both of the center axes are cylinders (not shown) extending perpendicularly to the paper surface 21). The inclination angles of the outer peripheral suction hole 23a and the inner peripheral suction hole 23b with respect to the spring hole 26 and the vane groove 24 are?. It is necessary to reduce the angle? In order to accelerate the compression start (reduce the compression start angle) and improve the volume efficiency of the compressor. Therefore, the angle? Is set to a value as small as possible within a range in which the inner peripheral suction hole 23b does not interfere with the spring hole 26 and the vane groove 24.

3 is a top view showing the configuration of the cylinder 21 of the compressor 1 according to the present embodiment. In Fig. 3, only the portion corresponding to the upper left portion of Fig. 2 of the cylinder 21 is shown. As shown in Fig. 3, the suction hole 23 of the present embodiment has an outer peripheral suction hole 23a having a diameter? D and a suction hole 23b having a diameter? D smaller than the diameter? And an inner peripheral suction hole 23b having a diameter d. In the present embodiment, however, the central axis C2 of the inner peripheral suction hole 23b is parallel to the central axis C1 of the outer peripheral suction hole 23a, but eccentric to the central axis C1. The center axis C1 of the outer circumferential suction hole 23a intersects the center axis C3 of the cylinder 21 and the center axis C2 of the inner circumferential suction hole 23b intersects the center axis C2 of the cylinder 21. [ (C3). The eccentric direction of the central axis C2 with respect to the central axis C1 is set in a plane perpendicular to the center axis C3 of the cylinder 21 and in the direction opposite to the spring hole 26 and the vane groove 24 to be. The eccentricity e of the central axis C2 with respect to the central axis C1 is set to be larger than the difference between the diameter? D of the outer suction hole 23a and the diameter? D of the inner suction hole 23b Difference) (e? (? D -? D) / 2). That is, when the outer peripheral suction hole 23a and the inner peripheral suction hole 23b are viewed in the direction of the center axis C1 (radial direction of the cylinder 21), the inner wall surface of the inner suction hole 23b Is in contact with the inner wall surface of the side suction hole (23a) or is located on the inner side than the inner wall surface of the side suction hole (23a).

The center axis C1 of the outer suction hole 23a located at the outermost periphery of the suction hole 23 intersects with the center axis C3 of the cylinder 21. In the structure of this embodiment, Therefore, the center axis C1 of the outer suction hole 23a can be perpendicular to the outer circumferential surface of the cylinder 21, so that the drilling of the suction hole 23 can be easily performed. The eccentricity e is equal to or smaller than half the difference between the diameter? D of the outer peripheral suction hole 23a and the diameter? D of the inner peripheral suction hole 23b. Therefore, when the suction hole 23 is formed, the perforation can be sequentially performed from the outer circumferential side of the cylinder 21 by one workpiece fixing. Therefore, the productivity of the compressor 1 can be prevented from being lowered.

2, the diameter d of the inner suction hole 23b is set to be equal to the eccentric amount? D, while the angle? Of the structure shown in Fig. 2 is maintained, (double) of (e). That is, while maintaining the cylinder height of the compressor 1, the suction pressure loss can be reduced. This point will be described with reference to FIG.

4 is a top view showing the structure of the suction hole 23 formed in the cylinder 21 of the compressor 1 according to the present embodiment. In Fig. 4, the inner wall surface of the inner suction hole 23b in the configuration shown in Fig. 2 is indicated by a broken line. Here, the diameter of the inner circumferential suction hole 23b in the configuration shown in Fig. 2 is taken as? D1, and the diameter of the inner circumferential suction hole 23b of the present embodiment is taken as? D2. 4, the center axis C2 of the inner circumferential suction hole 23b is connected to the center axis C1 of the outer circumferential suction hole 23a by the spring hole 26 and the vane And is eccentrically disposed on the side opposite to the groove 24 (downward in Fig. 4). Thus, while maintaining the position of the inner wall surface on the side of the spring hole 26 and the vane groove 24 (on the right side in Fig. 4) in the inner suction hole 23b, that is, The diameter d2 of the inner suction hole 23b can be enlarged by twice the diameter e of the eccentricity e than the diameter d1 is satisfied (d2 = d1 + 2e). Therefore, in the compressor 1 in which the displacement volume can be increased while maintaining the cylinder height, the suction pressure loss can be further reduced, so that the compressor efficiency can be further improved. As a result, it is possible to reduce the size and weight while maintaining the capacity of the compressor 1, and energy saving can be realized in the air conditioner, the refrigerator or the freezer using the compressor 1. [

As described above, the compressor 1 according to the present embodiment includes the cylinder 21 housed in the closed container 60, the rolling piston 22 eccentrically rotating along the inner peripheral surface of the cylinder 21, A vane 25 for dividing the inside of the cylinder 21 into a suction chamber 28 and a compression chamber 29, a vane spring 30 for applying the vane 25 to the side of the rolling piston 22, And has a spring hole 26 for receiving the vane spring 30 and a suction hole 23 provided in the cylinder 21 for sucking the fluid from the outside into the suction chamber 28. [ The suction hole 23 has a plurality of portions having different diameters from the outer circumferential side to the inner circumferential side of the cylinder 21. The plurality of portions of the suction hole 23 are formed to have a smaller diameter on the inner circumferential side of the cylinder 21. The center axis C1 of the outermost circumferential side portion (in this example, the outer circumferential suction hole 23a) of the cylinder 21 intersects with the center axis C3 of the cylinder 21 among the plurality of portions. The center axis C2 of the other portion of the plurality of portions (in this example, the inner peripheral side suction hole 23b) is parallel to the center axis C1 of the outermost peripheral portion and is also parallel to the center axis C1 And is eccentric in the direction opposite to the direction in which the spring hole 26 is provided.

According to this configuration, the center axis C1 of the outermost circumferential side portion can be perpendicular to the outer circumferential surface of the cylinder 21, so that the drilling of the suction hole 23 can be easily performed, and the productivity of the compressor 1 Can be prevented. In addition, since the suction pressure loss can be reduced while maintaining the cylinder height of the compressor 1, the compressor efficiency of the compressor 1 can be further improved.

The eccentricity e of the center axis C2 of the outermost periphery side (the inner periphery suction hole 23b in this example) of the outermost periphery of the plurality of portions with respect to the central axis C1 of the outermost periphery side portion, Is equal to or less than half the difference between the diameter? D of the outermost circumferential portion and the diameter? D of the second portion.

The eccentricity (the amount of eccentricity relative to the center axis C1 of the outermost circumferential portion of the center axis C2 of the innermost circumferential side portion (the inner circumferential suction hole 23b in this example) of the cylinders 21 e is equal to or less than half the difference between the diameter d of the outermost circumferential portion and the diameter d of the innermost circumferential portion.

According to this configuration, when the suction hole 23 is formed, the perforation can be sequentially performed from the outer circumferential side of the cylinder 21 by one workpiece fixing, so that the productivity of the compressor 1 can be prevented from being lowered .

Other embodiments.

The present invention is not limited to the above-described embodiment, and various modifications are possible.

For example, in the above-described embodiment, the suction hole 23 having two portions (the outer peripheral suction hole 23a and the inner peripheral suction hole 23b) having different diameters is taken as an example. However, (Three or more portions having a smaller diameter on the inner circumferential side) may be provided. In this case, the central axis of the portion of the suction hole 23 located second from the outermost periphery of the cylinder 21 and the central axis of the portion of the suction hole 23 located on the outermost periphery side of the cylinder 21 Is preferably equal to or less than half the difference between the diameter of the outermost circumferential portion and the diameter of the second portion. The eccentric amount between the central axis of the portion of the suction hole 23 located on the innermost peripheral side of the cylinder 21 and the central axis of the portion of the suction hole 23 located on the outermost peripheral side of the cylinder 21 is Of the difference between the diameter of the outermost circumferential portion and the diameter of the innermost circumferential portion.

In the above embodiment, the compressor 1 having two cylinders 21 and 31 is taken as an example. However, the present invention can also be applied to a compressor having one or more cylinders.

The above-described embodiments and modifications can be combined with each other.

1: Compressor
10: compression mechanism
11: Head support
12: Auxiliary
21, 31: Cylinder
22, 32: rolling piston
23, 33: suction hole
23a: outer suction hole
23b: inner peripheral side suction hole
24: Vane groove
25: Vane
26: Spring hole
27: Discharge hole
28: suction chamber
29: compression chamber
30: Vane spring
40: Four plates
50: electric donation
51: stator
52: Rotor
53: Crankshaft
54a, 54b:
60: airtight container
61: Accumulator
62, 63: suction pipe
64: Discharge tube
C1, C2, C3: center axis

Claims (3)

A cylinder accommodated in the hermetically sealed container,
A rolling piston eccentrically rotating along the inner circumferential surface of the cylinder,
A vane which divides the inside of the cylinder into a suction chamber and a compression chamber,
A vane spring for urging the vane toward the rolling piston,
A spring hole provided in the cylinder for receiving the vane spring,
And a suction hole provided in the cylinder for sucking fluid from the outside into the suction chamber,
Wherein the suction hole comprises at least two holes different in diameter from the outer peripheral side to the inner peripheral side of the cylinder,
The at least two holes are formed to have a smaller diameter on the inner circumferential side of the cylinder,
The central axis of the outermost peripheral hole of the cylinder among the at least two holes intersects the central axis of the cylinder,
Wherein the central axis of the other hole among the at least two holes is in a twisted position with respect to the center axis of the cylinder and is parallel to the central axis of the outermost peripheral hole and is in a direction And is eccentric in the opposite direction. The method according to claim 1,
The eccentric amount of the central axis of the outermost peripheral hole to the central axis of the outermost peripheral hole of the at least two holes among the at least two outermost holes is preferably half the difference between the diameter of the outermost peripheral hole and the diameter of the second hole Or less. 3. The method according to claim 1 or 2,
The eccentric amount of the central axis of the innermost perimeter hole of the cylinder among the at least two holes with respect to the central axis of the outermost perimeter hole is equal to one half of the difference between the diameter of the outermost perimeter hole and the diameter of the innermost perimeter hole Or less.

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